We installed a small (36") three-piece fiberglass shower stall about 25 years ago. The unit has a base and two wall pieces that join at in the middle of the back wall. We use it daily and plan to replace it with something nice some time down the road, but it isn't in the budget right now.
The problem is the caulk in the joints regularly become moldy. All the regular methods of cleaning only lasts a short time and the mold returns. I think my best attack would be to remove and replace the old dried out caulk. Problem is how to get the old hard caulk out without major damage to the fiberglass. The joints are pretty small, 1/8 inch or less, so there is not much work room.
Before I go at it with my utility knife, I thought I'd see if anyone had any better ideas.
Thanks!
Mark